Malicious PDF — malware analysis report

Static analysis result for SHA-256 738e41717ee9c355…

MALICIOUS

PDF

76.3 KB Created: 2021-02-12 18:37:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 70234bf099ce18c46960d0422c81ea04 SHA-1: d0eb7c685a52ca15b1130098e31f28634b542e7a SHA-256: 738e41717ee9c35591c2908308f0bfe5de46a6b9f91242e8d8b822ba1730ee5d
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains an embedded URI pointing to a suspicious domain, identified as a link farm on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery. Although no scripts were directly extracted, the PDF structure and embedded URLs suggest an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://jacksth.ru/wix?keyword=charles+zi+britannia+reddit PDF link annotation
    • http://twobigs.space/wolodamenofusovizetaktsiei.pdfIn PDF document text
    • http://gobigs.space/rosudivejireniganimi3l9lm.pdfIn PDF document text
    • http://xtrading.buzz/xivabijog8rqs9.pdfIn PDF document text
    • https://jadowusirufire.weebly.com/uploads/1/3/2/7/132740355/4933901.pdfIn PDF document text
    • http://arfesopt.com/52120941378xnyaj.pdfIn PDF document text
    • https://guzoxufogoxuwo.weebly.com/uploads/1/3/4/0/134097696/fubufusepudorani.pdfIn PDF document text
    • http://my-favshopc.online/xenofesufixutizirh28n9.pdfIn PDF document text
    • https://labelamujevodit.weebly.com/uploads/1/3/1/6/131606697/d68f6d760f10008.pdfIn PDF document text
    • https://xuzabuteke.weebly.com/uploads/1/3/1/3/131379980/jifewosulo.pdfIn PDF document text
    • https://cdn.sqhk.co/sazobenapur/X6DAphf/4104054278.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/wisuw/37103858955.pdfIn PDF document text
    • https://s3.amazonaws.com/xebuvuwov/phase_3_phonics_worksheets_sparklebox.pdfIn PDF document text
    • https://s3.amazonaws.com/wuzalugiseto/23366831263.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cccd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCCD 6416 bytes
SHA-256: 9277bf2ebd35c01f736528a31a72f405b42bcca9b5b8c14771b6fa083d339c06
font_01_sfnt_off0000e2a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2A3 4804 bytes
SHA-256: 9bda2053ac3ada775b459b201100c7e27c557621e4d6b924eb71458ce71eebc7
font_02_sfnt_off0000f2e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2E2 10276 bytes
SHA-256: 0778e7742580907e9557e7299825c376e953809ef7490c4da7653751cebfa90a
font_03_sfnt_off00011600.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11600 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34

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